In reply to G7LAS:
I too have recently started to use a dual band ladder line slim jim on top of a 10m Linfaee roach pole.
Based on my own experiences, since changing over to this for 2m fm and 70cms fm,I can only say yes it does make a difference.
I’m not the technically minded type so I’ll leave that to others when it comes to radio and aerials. All I can say is that it’s working for me with some very intersting and favourable results.
Little Mell Fell is one good example. From my home QTH this is not workable, even with a lift on. The first time I used this set up on this fell, Colin almost managed to work me from the home QTH.
The same also for the SOTA/WOTA summit Halin Fell. Another difficult fell to work from due to it’s location.
I have also been getting much more favourable reports from chasers on fells worked before and in the case of the fell above, even managed to work into Scotland on 2m fm for a S2S contact with report of 5/9.
This weekend Colin and I worked another difficult fell to get out from, the WOTA summit of Barf, yet we managed to get 12 contacts and worked into Annan in Scotland at 5/9 also. We also managed to get Neil 2M0NCM from our third summit of the day WOTA summit Broom Fell, bringing a total of seven S2S’s for the day. Both of these were much lower than Lord’s Seat and Barf in particular is quite enclosed.
I seriously doubt we would have has this level of success without the additional height.